Apparatus and method for the manufacture of hot-rolled steel

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab and reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and a ratio of the radius of each of said rolls of said two-high roll stand to the thickness of the slab before reduction by said rolls (R-H-ratio) is at least 3.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab and reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and the square root of a ratio of the thickness reduction of the thin slab and the radius of each said roll of said two-high roll stand is less than 1.1 times the arc tangent of the coefficient of friction between the slab and the roll.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab and reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and a ratio between the radius of each of said rolls of said two-high roll stand and the height of the roll gap of said two-high roll stand is at least 10.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab and reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and a radius of each said roll of said two-high roll stand is at least 400 mm.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab, reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and means for reducing the thickness of the slab before complete solidification of the slab and before said hot-rolling in said two-high roll stand.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab, reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and a high-pressure liquid jet means for removing an oxide layer on the slab between said continuous casting machine and said two-high roll stand.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab, reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and a lubricant feed system for applying a lubricant between the slab and said rolls of said two-high roll stand.

Apparatus for the manufacture of hot-rolled steel strip, comprising a continuous casting machine for casting steel slab, reduction means comprising a two-high roll stand having a pair of rolls adapted for hot-rolling of said slab into strip, said two-high roll stand being incorporated in continuous line with said continuous casting machine to perform continuous rolling of said slab and means for rolling the strip ferritically arranged after its rolling in said two-high roll stand.

Method for the manufacture of steel strip comprising the steps of (a)continuously casting steel into slab in a continuous casting machine and (b) effecting hot-rolling reduction of said slab into strip by hot-rolling at least in the austenitic region, said hot-rolling reduction of the slab in the austenitic region comprising a single pass through a two-high roll stand having a pair of rolls adapted to effect reduction of the slab into strip.